Mr. Lin is 72 years old and has had pain in his left knee for more than 20 years. He went to the hospital to have a radiograph and found joint stenosis and bone spur formation, and has been taking various medications to treat it. In the last six months, the pain has led to an inability to walk long distances, and the knee pain is aggravated when he goes out for a walk. And the old man has a wonderful dream that needs to be fulfilled, which is to accompany his old companion on a trip. There is no doubt that with a broken knee, a person is like an old car with worn out tires that can no longer travel far. But Mr. Lin’s heart, lungs and other internal organs do not have any problems, so the old man is always reluctant to live on like this. The human body is a sophisticated and self-repairing “machine”. The joints are like the bearings or tires of a car, in the process of human movement will appear interface friction, with the increase in age, the surface of the joints transparent cartilage to varying degrees of wear and tear. When you are young, your cartilage has a strong ability to repair, but after the age of 30, the ability to repair gets worse and worse, due to genetics, trauma and other factors, the ability to repair cartilage varies from person to person. When cartilage wear is greater than repair, cartilage wear increases, cartilage becomes thinner, joint space becomes narrow, and bone spurs form, at which point it is called osteoarthritis. According to research, 50% of people over the age of 65 suffer from varying degrees of osteoarthritis. Osteoarthritis is best in the knee joint. Mr. Lin is such a patient. In the early stages of osteoarthritis, physical therapy and medication are mainly used to control the rate of joint degeneration, reduce joint pain and improve the quality of life. Is there any way to improve the quality of life with severe osteoarthritis like Mr. Lin’s? Is Mr. Lin’s dream of traveling with his boss really just a dream that is out of reach in this life? If a car’s tires are worn out and can be replaced with new ones, can a person’s joints be rebuilt as well? The answer is yes. As early as the 1960s, surgeons began experimenting with artificial knee replacement surgery, and in the 1970s and 1980s, knee replacement technology was widely developed in foreign countries, bringing hope for recovery to patients with severe osteoarthritis. Decades later, knee replacement has matured, and depending on the extent of the lesion, there are options for total knee surface replacement, knee unicondylar replacement, patellofemoral joint replacement, and other targeted surgical treatments. Mr. Lin came to the clinic and was carefully examined and reviewed his medical history, and x-rays were taken to confirm the diagnosis of osteoarthritis of the left knee and inversion deformity of the knee. He was hospitalized for 2 days and underwent total knee surface replacement surgery on the third day. Six months have passed and Mr. Lin is now able to travel far and wide to fulfill his dream of traveling in his old age. The joy of travel seems to have reborn Mr. Lin, and the joy of life is far from that of the crippled old man whose knee was too painful to walk long distances.